package com.whq.knowverywell.util.code;

import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;

import javax.crypto.Cipher;

/** 
* RSA安全编码组件  
*    
* @version 1.0  
* @since 1.0  
*/   
public class RSACoder  extends Coder{     
    public static final String KEY_ALGORITHM = "RSA";     
    public static final String SIGNATURE_ALGORITHM = "MD5withRSA";     
  
    private static final String PUBLIC_KEY = "RSAPublicKey";     
    private static final String PRIVATE_KEY = "RSAPrivateKey";     
  
    /** *//**  
     * 用私钥对信息生成数字签名  
     *    
     * @param data  
     *            加密数据  
     * @param privateKey  
     *            私钥  
     *    
     * @return  
     * @throws Exception  
     */   
    public static String sign(byte[] data, String privateKey) throws Exception {     
        // 解密由base64编码的私钥     
        byte[] keyBytes = decryptBASE64(privateKey);     
  
        // 构造PKCS8EncodedKeySpec对象     
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);     
  
        // KEY_ALGORITHM 指定的加密算法     
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);     
  
        // 取私钥匙对象     
        PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);     
  
        // 用私钥对信息生成数字签名     
        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);     
        signature.initSign(priKey);     
        signature.update(data);     
  
        return encryptBASE64(signature.sign());     
    }     
  
    /** *//**  
     * 校验数字签名  
     *    
     * @param data  
     *            加密数据  
     * @param publicKey  
     *            公钥  
     * @param sign  
     *            数字签名  
     *    
     * @return 校验成功返回true 失败返回false  
     * @throws Exception  
     *    
     */   
    public static boolean verify(byte[] data, String publicKey, String sign)     
            throws Exception {     
  
        // 解密由base64编码的公钥     
        byte[] keyBytes = decryptBASE64(publicKey);     
  
        // 构造X509EncodedKeySpec对象     
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);     
  
        // KEY_ALGORITHM 指定的加密算法     
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);     
  
        // 取公钥匙对象     
        PublicKey pubKey = keyFactory.generatePublic(keySpec);     
  
        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);     
        signature.initVerify(pubKey);     
        signature.update(data);     
  
        // 验证签名是否正常     
        return signature.verify(decryptBASE64(sign));     
    }     
  
    /** *//**  
     * 解密<br>  
* 用私钥解密 http://www.5a520.cn http://www.feng123.com 
     *    
     * @param data  
     * @param key  
     * @return  
     * @throws Exception  
     */   
    public static byte[] decryptByPrivateKey(byte[] data, String key)     
            throws Exception {     
        // 对密钥解密     
        byte[] keyBytes = decryptBASE64(key);     
  
        // 取得私钥     
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);     
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);     
        Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);     
  
        // 对数据解密     
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());     
        cipher.init(Cipher.DECRYPT_MODE, privateKey);     
  
        return cipher.doFinal(data);     
    }     
  
    /** *//**  
     * 解密<br>  
     * 用私钥解密  
     *    
     * @param data  
     * @param key  
     * @return  
     * @throws Exception  
     */   
    public static byte[] decryptByPublicKey(byte[] data, String key)     
            throws Exception {     
        // 对密钥解密     
        byte[] keyBytes = decryptBASE64(key);     
  
        // 取得公钥     
        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);     
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);     
        Key publicKey = keyFactory.generatePublic(x509KeySpec);     
  
        // 对数据解密     
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());     
        cipher.init(Cipher.DECRYPT_MODE, publicKey);     
  
        return cipher.doFinal(data);     
    }     
  
    /** *//**  
     * 加密<br>  
     * 用公钥加密  
     *    
     * @param data  
     * @param key  
     * @return  
     * @throws Exception  
     */   
    public static byte[] encryptByPublicKey(byte[] data, String key)     
            throws Exception {     
        // 对公钥解密     
        byte[] keyBytes = decryptBASE64(key);     
  
        // 取得公钥     
        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);     
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);     
        Key publicKey = keyFactory.generatePublic(x509KeySpec);     
  
        // 对数据加密     
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());     
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);     
  
        return cipher.doFinal(data);     
    }     
  
    /** *//**  
     * 加密<br>  
     * 用私钥加密  
     *    
     * @param data  
     * @param key  
     * @return  
     * @throws Exception  
     */   
    public static byte[] encryptByPrivateKey(byte[] data, String key)     
            throws Exception {     
        // 对密钥解密     
        byte[] keyBytes = decryptBASE64(key);     
  
        // 取得私钥     
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);     
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);     
        Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);     
  
        // 对数据加密     
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());     
        cipher.init(Cipher.ENCRYPT_MODE, privateKey);     
  
        return cipher.doFinal(data);     
    }     
  
    /** *//**  
     * 取得私钥  
     *    
     * @param keyMap  
     * @return  
     * @throws Exception  
     */   
    public static String getPrivateKey(Map<String, Object> keyMap)     
            throws Exception {     
        Key key = (Key) keyMap.get(PRIVATE_KEY);     
  
        return encryptBASE64(key.getEncoded());     
    }     
  
    /** *//**  
     * 取得公钥  
     *    
     * @param keyMap  
     * @return  
     * @throws Exception  
     */   
    public static String getPublicKey(Map<String, Object> keyMap)     
            throws Exception {     
        Key key = (Key) keyMap.get(PUBLIC_KEY);     
  
        return encryptBASE64(key.getEncoded());     
    }     
  
    /** *//**  
     * 初始化密钥  
     *    
     * @return  
     * @throws Exception  
     */   
    public static Map<String, Object> initKey() throws Exception {     
        KeyPairGenerator keyPairGen = KeyPairGenerator     
                .getInstance(KEY_ALGORITHM);     
        keyPairGen.initialize(1024);     
  
        KeyPair keyPair = keyPairGen.generateKeyPair();     
  
        // 公钥     
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();     
  
        // 私钥     
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();     
  
        Map<String, Object> keyMap = new HashMap<String, Object>(2);     
  
        keyMap.put(PUBLIC_KEY, publicKey);     
        keyMap.put(PRIVATE_KEY, privateKey);     
        return keyMap;     
    }    
    
    
    public static void main(String[] args) throws Exception {
    	String privateKey = "MIICeAIBADANBgkqhkiG9w0BAQEFAASCAmIwggJeAgEAAoGBALJZVwM1Bd+1U4P9" +
"P5RrL7pyxUPImsnd+mpdRXQLXvE6SmIq4BBBPu9Jcs4q/BvIlF1rfrQetNNSkt6d" +
"z7+03yDJ8Yhal5wtGdVXDJa3YU3VHrlbELEFS3o+vY2E1MKOh5q2VgOfkPy3LSv2" +
"xE9e/tUpwUIVONjv4EJjvT4mvKTlAgMBAAECgYEAg8gBxEvkiDUqfaed2CQPQzxU" +
"yE4tGaYcx4Udsa5JPANvPPQjVb9wKk1iODaIzFq8Tf8Ew0DBKjikbzu6axPRneJH" +
"CXSmyBzQxH5NC6gA2QRhfD0sk9dzxgNfVMXeIgwAHyl8APc3D9femB6sayrGUOCc" +
"CyhWjxN1T8PXLcs+ha0CQQDs2S0hoDduFzbA0/x1XGnBXx4oy7vS3Ro3OPnbU0D7" +
"sG5jVS0PZzOigbBBgYdccrgzAcvM7lNc5bLcSvrYnP0bAkEAwMU2Fhm5uU/eriZ9" +
"vKB3zXd78xNA+VFL+LVgPoylMuOh85X9Yt+YFI54iONhqWtSmfGAD3kYCC3RUFWo" +
"0fEF/wJBAN+BbmJ+A/Di/StooKPLqoztitNqtvsc5UFZhgdgAEHDU9hvJ4+Sjxp6" +
"ke6vIiKuq36O4lioSoiuxmO2ahOByiMCQH735j38R8X1A3i1RZAeKYqdrnhWMC+H" +
"CoEQBgps3Mp+AEfOfQzItQSlKmMPUV4joE5hMLYAToHkm79MDFvrYsUCQQDQI8fe" +
"+XMe5/gfeAlrEnWrznQTH/WAyST0YQSI7459O7N9MWhm1q91Pvzx/U1o5oBLtFL3" +
"d3zK6zBaFAckF426";
    	
    	String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCyWVcDNQXftVOD/T+Uay+6csVD" +
"yJrJ3fpqXUV0C17xOkpiKuAQQT7vSXLOKvwbyJRda360HrTTUpLenc+/tN8gyfGI" +
"WpecLRnVVwyWt2FN1R65WxCxBUt6Pr2NhNTCjoeatlYDn5D8ty0r9sRPXv7VKcFC" +
"FTjY7+BCY70+Jryk5QIDAQAB";
    	
    	
    	
//    	Map<String, Object> keyMap = initKey();     
    	  
//    	String publicKey = getPublicKey(keyMap);     
//    	String privateKey = getPrivateKey(keyMap);     
//        System.err.println("公钥: \n\r" + publicKey);     
//        System.err.println("私钥： \n\r" + privateKey);
        
        
//        System.err.println("公钥加密——私钥解密");     
//        String inputStr = "abc";     
//        byte[] data = inputStr.getBytes();     
//  
//        byte[] encodedData = RSACoder.encryptByPublicKey(data, publicKey);     
//  
//        byte[] decodedData = RSACoder.decryptByPrivateKey(encodedData, privateKey);     
//  
//        String outputStr = new String(decodedData);     
//        System.err.println("加密前: " + inputStr + "\n\r" + "解密后: " + outputStr); 
        
        
        System.err.println("私钥加密——公钥解密");     
        String inputStr = "我是老鳖";     
        System.err.println("加密前: " + inputStr); 
        
        byte[] data = inputStr.getBytes();     
  
        byte[] encodedData = RSACoder.encryptByPrivateKey(data, privateKey);     
        
        System.err.println("加密后: " + encryptBASE64(encodedData)); 
  
        byte[] decodedData = RSACoder.decryptByPublicKey(encodedData, publicKey);     
  
        String outputStr = new String(decodedData);     
        System.err.println("解密后: " + outputStr);     
	}
}  
